This Bandsaw Blade Measurement & Conversion Guide brings together the most commonly used blade measurements, thickness conversions, width charts and TPI references in one place. Whether you’re selecting a new bandsaw blade, measuring an existing blade or converting between imperial and metric sizes, you’ll find practical workshop reference information used every day in New Zealand.
You’ll find quick conversions for inches to millimetres, blade thicknesses (thou), blade widths, common NZ blade sizes, sawmill tooth pitch, downloadable conversion charts and our interactive blade TPI calculators for both metal and wood cutting.
These charts are used every day in our Auckland workshop when manufacturing custom bandsaw blades for customers throughout New Zealand and provide a practical reference for engineers, fabricators, sawmills, maintenance staff and home workshops.
In engineering workshops, blade thickness is commonly expressed in thou (thousandths of an inch). If you’re unfamiliar with the term, see this explanation of thousandths of an inch (thou).
Quick Bandsaw Blade Workshop Reference
Common Blade Thicknesses
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| Common name | Inches | mm |
|---|---|---|
| 14 thou | 0.014″ | 0.36 |
| 20 thou | 0.020″ | 0.50 |
| 22 thou | 0.022″ | 0.56 |
| 25 thou | 0.025″ | 0.65 |
| 35 thou | 0.035″ | 0.90 |
| 42 thou | 0.042″ | 1.07 |
| 50 thou | 0.050″ | 1.27 |
| 63 thou | 0.063″ | 1.60 |
Common Blade Widths
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| Imperial | Decimal | mm | Common NZ size |
|---|---|---|---|
| 1/8″ | 0.125″ | 3.18 | 3 mm |
| 1/4″ | 0.250″ | 6.35 | 6 mm |
| 3/8″ | 0.375″ | 9.53 | 10 mm |
| 1/2″ | 0.500″ | 12.70 | 13 mm |
| 5/8″ | 0.625″ | 15.88 | 16 mm |
| 3/4″ | 0.750″ | 19.05 | 19 mm |
| 1″ | 1.000″ | 25.40 | 27 mm bi-metal |
| 1 1/4″ | 1.250″ | 31.75 | 34 mm bi-metal |
| 1 1/2″ | 1.500″ | 38.10 | 41 mm bi-metal |
| 2″ | 2.000″ | 50.80 | 54 mm bi-metal |
| 2 1/2″ | 2.500″ | 63.50 | 67 mm bi-metal |
Coarse Sawmill Tooth Pitch
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| Pitch | Calculation | TPI |
|---|---|---|
| 3/4″ | 1 ÷ 0.750 | 1.33 |
| 7/8″ | 1 ÷ 0.875 | 1.14 |
| 1″ | 1 ÷ 1.000 | 1.00 |
In real sawmill use these are often rounded. For example, 3/4″ pitch is commonly sold as about 1.3 TPI, and 7/8″ pitch is often sold as about 1.1 TPI.
For those into Math’s 1 inch = 25.4mm so 0.020 ( twenty thou) = 0.02 x 25.4 = 0.5mm and conversely .63mm = 0.63/25.4 = 0.0248″ ( or 25 thou)
Thousands (Thou) to Millimetres Conversion Chart
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| Inches | mm | Inches | mm | Inches | mm | Inches | mm | Inches | mm |
|---|---|---|---|---|---|---|---|---|---|
| .0005 | 0.0127 | .006 | 0.1524 | .016 | 0.4064 | .035 | 0.8890 | .100 | 2.5400 |
| .0010 | 0.0254 | .007 | 0.1778 | .018 | 0.4572 | .040 | 1.0160 | .125 | 3.1750 |
| .0015 | 0.0381 | .008 | 0.2032 | .020 | 0.5080 | .045 | 1.1430 | .250 | 6.3500 |
| .0020 | 0.0508 | .009 | 0.2286 | .022 | 0.5588 | .050 | 1.2700 | .500 | 12.7000 |
| .0025 | 0.0635 | .010 | 0.2540 | .024 | 0.6096 | .060 | 1.5240 | .750 | 19.0500 |
| .0030 | 0.0762 | .011 | 0.2794 | .025 | 0.6350 | .0625 | 1.5875 | 1.00 | 25.4000 |
| .0035 | 0.0889 | .012 | 0.3048 | .026 | 0.6604 | .070 | 1.7780 | 1.25 | 31.7500 |
| .0040 | 0.1016 | .013 | 0.3302 | .028 | 0.7112 | .075 | 1.9050 | 1.50 | 38.1000 |
| .0045 | 0.1143 | .014 | 0.3556 | .030 | 0.7620 | .080 | 2.0320 | 1.75 | 44.4500 |
| .0050 | 0.1270 | .015 | 0.3810 | .032 | 0.8128 | .090 | 2.2860 | 2.00 | 50.8000 |
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| mm | Inches | mm | Inches | mm | Inches | mm | Inches | mm | Inches |
|---|---|---|---|---|---|---|---|---|---|
| 0.010 | 0.00039 | 0.090 | 0.00354 | 0.250 | 0.00984 | 0.950 | 0.03740 | 8.000 | 0.31496 |
| 0.015 | 0.00059 | 0.095 | 0.00374 | 0.260 | 0.01024 | 1.000 | 0.03937 | 9.000 | 0.35433 |
| 0.020 | 0.00079 | 0.100 | 0.00394 | 0.280 | 0.01102 | 1.100 | 0.04331 | 10.000 | 0.39370 |
| 0.025 | 0.00098 | 0.105 | 0.00413 | 0.300 | 0.01181 | 1.200 | 0.04724 | 11.000 | 0.43307 |
| 0.030 | 0.00118 | 0.110 | 0.00433 | 0.350 | 0.01378 | 1.250 | 0.04921 | 12.000 | 0.47244 |
| 0.035 | 0.00138 | 0.115 | 0.00453 | 0.400 | 0.01575 | 1.500 | 0.05906 | 13.000 | 0.51181 |
| 0.040 | 0.00157 | 0.120 | 0.00472 | 0.450 | 0.01772 | 2.000 | 0.07874 | 14.000 | 0.55118 |
| 0.045 | 0.00177 | 0.125 | 0.00492 | 0.500 | 0.01969 | 2.500 | 0.09843 | 15.000 | 0.59055 |
| 0.050 | 0.00197 | 0.130 | 0.00512 | 0.550 | 0.02165 | 3.000 | 0.11811 | 16.000 | 0.62992 |
| 0.055 | 0.00217 | 0.140 | 0.00551 | 0.600 | 0.02362 | 3.500 | 0.13780 | 17.000 | 0.66929 |
| 0.060 | 0.00236 | 0.150 | 0.00591 | 0.650 | 0.02559 | 4.000 | 0.15748 | 18.000 | 0.70866 |
| 0.065 | 0.00256 | 0.160 | 0.00630 | 0.700 | 0.02756 | 4.500 | 0.17717 | 19.000 | 0.74803 |
| 0.070 | 0.00276 | 0.180 | 0.00709 | 0.750 | 0.02953 | 5.000 | 0.19685 | 20.000 | 0.78740 |
| 0.075 | 0.00295 | 0.200 | 0.00787 | 0.800 | 0.03150 | 5.500 | 0.21654 | 21.000 | 0.82677 |
| 0.080 | 0.00315 | 0.220 | 0.00866 | 0.850 | 0.03346 | 6.000 | 0.23622 | 22.000 | 0.86614 |
| 0.085 | 0.00335 | 0.240 | 0.00945 | 0.900 | 0.03543 | 7.000 | 0.27559 | 25.400 | 1.00000 |
Prefer a printable version?
⬇ Download the complete PDF conversion chart
Bandsaw Blade TPI Calculators
Metal Cutting Bandsaw Blade TPI Calculator
United Products / NZ Bandsaw Blade TPI Calculator
Use this calculator to find an approximate starting point for selecting the correct bandsaw blade tooth pitch. Choose the material type, enter the relevant size, and the recommendation will update automatically.
The calculator will recommend an approximate starting TPI once a valid size is entered.
This calculator provides an approximate starting point only. Final blade selection can depend on material grade, machine condition, work holding, cutting speed, coolant, bundle cutting and operator preference.
© 2026 United Products Ltd. All rights reserved. The United Products NZ Bandsaw Blade TPI Calculator is proprietary software developed for unitedproducts.co.nz.
Wood Bandsaw Blade TPI & Radius Calculator
Wood Bandsaw Blade TPI & Radius Calculator
Use this calculator to choose a practical wood bandsaw blade tooth pitch and, for curved work, the maximum blade width for the radius you need to cut.
The calculator will recommend a starting TPI. Choose radius cutting if you also need a blade width recommendation.
This calculator provides an approximate starting point only. Final blade selection can depend on timber species, green or dry timber, blade condition, machine condition, feed pressure, guide setup and the quality of finish required.
© 2026 United Products Ltd. All rights reserved. The United Products Wood Bandsaw Blade Calculator is proprietary software developed for unitedproducts.co.nz.
Related Bandsaw Blade Resources
- Industrial Bandsaw Blade Lengths by Machine Model
- Common Bandsaw Blade Sizes
- Variable Pitch Bandsaw Blade TPI Calculator
- Wood Blade TPI Calculator
- Comprehensive Guide to Selecting Bandsaw Blade TPI (Teeth Per Inch)
- How to order a Bandsaw Blade on the United Products website
- learn how to measure it Your Blade
